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Trace: • Raspberry Pi Pico MMU - Set up the Pico
04_projects:03_rpi2040_pico_mmu

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04_projects:03_rpi2040_pico_mmu [2025/08/21 12:09] – [Hardware BOM] jattie04_projects:03_rpi2040_pico_mmu [2025/08/22 18:34] (current) – [Prototype and build controller board] jattie
Line 306: Line 306:
         }         }
     def decl_command(self, req):     def decl_command(self, req):
-        if "prtouch" in req or "get_pres" in req or "get_steps" in req or "step_prtouch" in req:+        #if "prtouch" in req or "get_pres" in req or "get_steps" in req or "step_prtouch" in req: 
 +        #    return 
 +        if any(key in req for key in ("prtouch", "get_pres", "get_steps", "step_prtouch")):
             return             return
         funcname, flags, msgname = req.split()[1:4]         funcname, flags, msgname = req.split()[1:4]
Line 388: Line 390:
   * Acquire the hardware components   * Acquire the hardware components
   * 3D print the Pico MMU Parts   * 3D print the Pico MMU Parts
 +  * Prototype and build controller board
   * Assemble and configure the MMU   * Assemble and configure the MMU
  
Line 393: Line 396:
 ===== Hardware BOM ===== ===== Hardware BOM =====
  
-The original hardware BOM is from the [[https://github.com/lhndo/LH-Stinger/wiki/Pico-MMU#BOM|Pico MMU Page]]+The original hardware BOM is from the [[https://github.com/lhndo/LH-Stinger/wiki/Pico-MMU#BOM|Pico MMU Page]] with links added for the screws. 
 + 
 +^Item ^Quantity^Image^Delivered Cost^Quantity^ 
 +|[[https://s.click.aliexpress.com/e/_oDr5to3|EMAX ES3004 Servo (EMAX)]]|  1  | {{:04_projects:mmu:screenshot_2025-08-21_132047.png?direct&50|}}|  €14.39  |  1  |  €14.39  | 
 +|[[https://s.click.aliexpress.com/e/_DDhtjPj|Nema 17 (max 40mm length)]]|  1  |{{:04_projects:mmu:screenshot_2025-08-21_132113.png?direct&50|}}|  €15.00  |  1  |  €15.00| 
 +|[[https://s.click.aliexpress.com/e/_ooVBpL1|Steel D-Shaft 5mm x 90mm **]]|  2  |{{:04_projects:mmu:screenshot_2025-08-21_132153.png?direct&50|}}|  €9.38  |  5  |  €3.75  | 
 +|[[https://s.click.aliexpress.com/e/_DeqGPvP|Bearing MR115]]|  4  |{{:04_projects:mmu:screenshot_2025-08-21_132224.png?direct&50|}}|  €7.99  |  10  |  €3.17  | 
 +|[[https://s.click.aliexpress.com/e/_DDpZxF7|Bearing MR83]]|  4  |{{:04_projects:mmu:screenshot_2025-08-21_132253.png?direct&50|}}|  €7.01  |  10  |  €2.81  | 
 +|[[https://s.click.aliexpress.com/e/_DErKaQz|BMG Hardened Drive Gears]] (with grub screw)|  4 pairs!  |{{:04_projects:mmu:screenshot_2025-08-21_132338.png?direct&50|}}|  €8.10  |  4  |  €8.10  | 
 +|[[https://s.click.aliexpress.com/e/_DCqpjY5|PTFE Tube 4mm OD, 3mm ID]]|  1  |{{:04_projects:mmu:screenshot_2025-08-21_132422.png?direct&50|}}|  €1.75  |  1m  |  €7.00  | 
 +|[[https://s.click.aliexpress.com/e/_DBXcy4h|ECAS 4 Collet]]|  8  |{{:04_projects:mmu:screenshot_2025-08-21_132451.png?direct&50|}}|  €4.03  |  10  |  €3.22  | 
 +|[[https://s.click.aliexpress.com/e/_okGVowl|Belt GT2 *]]|  25cm  |{{:04_projects:mmu:screenshot_2025-08-21_132541.png?direct&50|}}|  -  |  -  |  €1.00  | 
 +|[[https://s.click.aliexpress.com/e/_Dci6SvT|Heat Insert M3 5mm (D) x 4mm (L)]]|  23  |{{:04_projects:mmu:screenshot_2025-08-21_132716.png?direct&50|}}|  €7.14  |  100  |  €1.64  | 
 +|[[https://www.aliexpress.com/item/1005008841266415.html?spm=a2g0o.productlist.main.4.50dd2550nYYHHV&aem_p4p_detail=202508210458301928654897414240003143910&algo_pvid=54a76a4b-5dff-4a79-b6dd-219586035acf&algo_exp_id=54a76a4b-5dff-4a79-b6dd-219586035acf-3&pdp_ext_f=%7B%22order%22%3A%22309%22%2C%22eval%22%3A%221%22%7D&pdp_npi=6%40dis%21EUR%212.31%210.87%21%21%2118.88%217.14%21%40210390c917557775101877624efd25%2112000046905198781%21sea%21IE%210%21ABX%211%210%21n_tag%3A-29910%3Bd%3Aefff38b4%3Bm03_new_user%3A-29895%3BpisId%3A5000000174211148&curPageLogUid=g69DhbDykCE8&utparam-url=scene%3Asearch%7Cquery_from%3A%7Cx_object_id%3A1005008841266415%7C_p_origin_prod%3A&search_p4p_id=202508210458301928654897414240003143910_1|Screw Cap Head M3 10mm]]|  3  |{{:04_projects:mmu:screenshot_2025-08-21_132804.png?direct&50|}}|  €1.73  |  50  |  €0.10| 
 +|[[https://www.aliexpress.com/item/1005008841266415.html?spm=a2g0o.productlist.main.4.50dd2550nYYHHV&aem_p4p_detail=202508210458301928654897414240003143910&algo_pvid=54a76a4b-5dff-4a79-b6dd-219586035acf&algo_exp_id=54a76a4b-5dff-4a79-b6dd-219586035acf-3&pdp_ext_f=%7B%22order%22%3A%22309%22%2C%22eval%22%3A%221%22%7D&pdp_npi=6%40dis%21EUR%212.31%210.87%21%21%2118.88%217.14%21%40210390c917557775101877624efd25%2112000046905198781%21sea%21IE%210%21ABX%211%210%21n_tag%3A-29910%3Bd%3Aefff38b4%3Bm03_new_user%3A-29895%3BpisId%3A5000000174211148&curPageLogUid=g69DhbDykCE8&utparam-url=scene%3Asearch%7Cquery_from%3A%7Cx_object_id%3A1005008841266415%7C_p_origin_prod%3A&search_p4p_id=202508210458301928654897414240003143910_1|Screw Cap Head M3 22mm]]|  2  |  :::  |  €2.94  |  50  |  €0.12  | 
 +|[[https://www.aliexpress.com/item/1005008841266415.html?spm=a2g0o.productlist.main.4.50dd2550nYYHHV&aem_p4p_detail=202508210458301928654897414240003143910&algo_pvid=54a76a4b-5dff-4a79-b6dd-219586035acf&algo_exp_id=54a76a4b-5dff-4a79-b6dd-219586035acf-3&pdp_ext_f=%7B%22order%22%3A%22309%22%2C%22eval%22%3A%221%22%7D&pdp_npi=6%40dis%21EUR%212.31%210.87%21%21%2118.88%217.14%21%40210390c917557775101877624efd25%2112000046905198781%21sea%21IE%210%21ABX%211%210%21n_tag%3A-29910%3Bd%3Aefff38b4%3Bm03_new_user%3A-29895%3BpisId%3A5000000174211148&curPageLogUid=g69DhbDykCE8&utparam-url=scene%3Asearch%7Cquery_from%3A%7Cx_object_id%3A1005008841266415%7C_p_origin_prod%3A&search_p4p_id=202508210458301928654897414240003143910_1|Screw Cap Head M3 30mm]]|  2  |  :::  |  €3,21  |  50  |  €0.13  | 
 +|[[https://www.aliexpress.com/item/1005008841266415.html?spm=a2g0o.productlist.main.4.50dd2550nYYHHV&aem_p4p_detail=202508210458301928654897414240003143910&algo_pvid=54a76a4b-5dff-4a79-b6dd-219586035acf&algo_exp_id=54a76a4b-5dff-4a79-b6dd-219586035acf-3&pdp_ext_f=%7B%22order%22%3A%22309%22%2C%22eval%22%3A%221%22%7D&pdp_npi=6%40dis%21EUR%212.31%210.87%21%21%2118.88%217.14%21%40210390c917557775101877624efd25%2112000046905198781%21sea%21IE%210%21ABX%211%210%21n_tag%3A-29910%3Bd%3Aefff38b4%3Bm03_new_user%3A-29895%3BpisId%3A5000000174211148&curPageLogUid=g69DhbDykCE8&utparam-url=scene%3Asearch%7Cquery_from%3A%7Cx_object_id%3A1005008841266415%7C_p_origin_prod%3A&search_p4p_id=202508210458301928654897414240003143910_1|Screw Cap Head M3 8mm]]|  2  |  :::  |  €1.44  |  50  |  €0.06  | 
 +|[[https://www.aliexpress.com/item/1005003116653232.html?spm=a2g0o.productlist.main.37.12a95137SnMSUx&algo_pvid=ce7aa035-c7ba-4222-83da-663d0ab0b494&algo_exp_id=ce7aa035-c7ba-4222-83da-663d0ab0b494-36&pdp_ext_f=%7B%22order%22%3A%2298%22%2C%22eval%22%3A%221%22%7D&pdp_npi=6%40dis%21EUR%210.99%210.45%21%21%211.13%210.52%21%402103963717557784164415169e96c1%2112000024187507657%21sea%21IE%21173564001%21X%211%210%21n_tag%3A-29919%3Bd%3Aefff38b4%3Bm03_new_user%3A-29895&curPageLogUid=MXkdjCZE5OQL&utparam-url=scene%3Asearch%7Cquery_from%3A%7Cx_object_id%3A1005003116653232%7C_p_origin_prod%3A|Screw Countersunk M3 10mm]]|  12  |{{:04_projects:mmu:screenshot_2025-08-21_132900.png?direct&50|}}|  €2.39  |  50  |  €0.57  | 
 +|[[https://www.aliexpress.com/item/1005003116653232.html?spm=a2g0o.productlist.main.37.12a95137SnMSUx&algo_pvid=ce7aa035-c7ba-4222-83da-663d0ab0b494&algo_exp_id=ce7aa035-c7ba-4222-83da-663d0ab0b494-36&pdp_ext_f=%7B%22order%22%3A%2298%22%2C%22eval%22%3A%221%22%7D&pdp_npi=6%40dis%21EUR%210.99%210.45%21%21%211.13%210.52%21%402103963717557784164415169e96c1%2112000024187507657%21sea%21IE%21173564001%21X%211%210%21n_tag%3A-29919%3Bd%3Aefff38b4%3Bm03_new_user%3A-29895&curPageLogUid=MXkdjCZE5OQL&utparam-url=scene%3Asearch%7Cquery_from%3A%7Cx_object_id%3A1005003116653232%7C_p_origin_prod%3A|Screw Countersunk M3 16mm]]|  4  |  :::  |  €3.31  |  50  |  €0.27  | 
 +|[[https://www.aliexpress.com/item/1005003116653232.html?spm=a2g0o.productlist.main.37.12a95137SnMSUx&algo_pvid=ce7aa035-c7ba-4222-83da-663d0ab0b494&algo_exp_id=ce7aa035-c7ba-4222-83da-663d0ab0b494-36&pdp_ext_f=%7B%22order%22%3A%2298%22%2C%22eval%22%3A%221%22%7D&pdp_npi=6%40dis%21EUR%210.99%210.45%21%21%211.13%210.52%21%402103963717557784164415169e96c1%2112000024187507657%21sea%21IE%21173564001%21X%211%210%21n_tag%3A-29919%3Bd%3Aefff38b4%3Bm03_new_user%3A-29895&curPageLogUid=MXkdjCZE5OQL&utparam-url=scene%3Asearch%7Cquery_from%3A%7Cx_object_id%3A1005003116653232%7C_p_origin_prod%3A|Screw Countersunk M3 8mm]]|  1  |  :::  |  €1.44  |  50  |  €0.03  | 
 +|[[https://www.aliexpress.com/item/1005006790023154.html?spm=a2g0o.productlist.main.4.79cc6f59MNFWYK&aem_p4p_detail=202508210518141993610376785640003142268&algo_pvid=e694344a-c739-406d-928f-791eb2c7076d&algo_exp_id=e694344a-c739-406d-928f-791eb2c7076d-3&pdp_ext_f=%7B%22order%22%3A%222650%22%2C%22eval%22%3A%221%22%7D&pdp_npi=6%40dis%21EUR%211.72%211.10%21%21%2114.06%219.00%21%40211b80c217557786941211148e7a30%2112000038308083836%21sea%21IE%21173564001%21X%211%210%21n_tag%3A-29919%3Bd%3Aefff38b4%3Bm03_new_user%3A-29895&curPageLogUid=LrK92G3yhSkB&utparam-url=scene%3Asearch%7Cquery_from%3A%7Cx_object_id%3A1005006790023154%7C_p_origin_prod%3A&search_p4p_id=202508210518141993610376785640003142268_1|Screw Grub M3 6mm]] (optional)|  2  |{{:04_projects:mmu:screenshot_2025-08-21_134755.png?direct&50|}}|  €1.92  |  55  |  €0.04  | 
 +^TOTAL ||||^  €61.04  | 
 + 
 +Based on the recent sandtable pico controller I anticipate to have similar controller costs that should land a populate board for €25. 
 + 
 +^MMU BOM Parts    |  €61  | 
 +^MMU Printed Parts|  €5  | 
 +^MMU Controller   |  €25  | 
 +^TOTAL            ^  €91  ^ 
 + 
 +<WRAP center round info 60%> 
 +Based on an investment cost of €91, I think a DIY Pico MMU is worth the investment costs to get automated spool switching on my K1 Max. 
 +</WRAP> 
 + 
 + 
 +===== 3D print the Pico MMU Parts ===== 
 + 
 + 
 +===== Prototype and build controller board ===== 
 + 
 +Hardware not featured on the Pico MMU pages are the extras I intend to use for the project: 
 + 
 +  * Pico 2040 as a Klipper Controller 
 +  * Voltage Regulator/Buck Convertor 
 +  * Connectors and Powersupplies 
 + 
 +==== How Servo Direction Works (ES3004 and Similar) ==== 
 + 
 +  * The servo receives a PWM signal at 50 Hz (one pulse every 20 ms). 
 +  * The length of each pulse (in microseconds) tells the servo what angle to move to. 
 +  * Direction is determined by whether the pulse width is increasing or decreasing: 
 +  * Shorter pulse (e.g., 700 µs) → rotate counter-clockwise 
 +  * Longer pulse (e.g., 2300 µs) → rotate clockwise 
 +  * The servo does not rotate continuously—it moves to a position and holds it. 
 + 
 +==== Direction Is Relative to Neutral ==== 
 + 
 +Neutral position is around 1500 µs 
 + 
 +From there: 
 + 
 +  * Decreasing pulse width → moves left (CCW) 
 +  * Increasing pulse width → moves right (CW) 
 + 
 +<WRAP center round tip 60%> 
 +So you're not telling it “go left” or “go right”—you're telling it “go to this position,” and the servo figures out the direction internally. 
 +</WRAP> 
 + 
 + 
 +===== Assemble and configure the MMU ===== 
  
-^Item ^Quantity^ 
-|[[https://s.click.aliexpress.com/e/_oDr5to3|EMAX ES3004 Servo (EMAX)]]|  1  | 
-|[[https://s.click.aliexpress.com/e/_DDhtjPj|Nema 17 (max 40mm length)]]|  1  | 
-|[[https://s.click.aliexpress.com/e/_ooVBpL1|Steel D-Shaft 5mm x 90mm **]]|  2  | 
-|[[https://s.click.aliexpress.com/e/_DeqGPvP|Bearing MR115]]|  4  | 
-|[[https://s.click.aliexpress.com/e/_DDpZxF7|Bearing MR83]]|  4  | 
-|[[https://s.click.aliexpress.com/e/_DErKaQz|BMG Hardened Drive Gears]] (with grub screw)|  4 pairs!  | 
-|[[https://s.click.aliexpress.com/e/_DCqpjY5|PTFE Tube 4mm OD, 3mm ID]]|  1  | 
-|[[https://s.click.aliexpress.com/e/_DBXcy4h|ECAS 4 Collet]]|  8  | 
-|[[https://s.click.aliexpress.com/e/_okGVowl|Belt GT2 *]]|  25cm  | 
-|[[https://s.click.aliexpress.com/e/_Dci6SvT|Heat Insert M3 5mm (D) x 4mm (L)]]|  23  | 
-|[[https://www.aliexpress.com/item/1005008841266415.html?spm=a2g0o.productlist.main.4.50dd2550nYYHHV&aem_p4p_detail=202508210458301928654897414240003143910&algo_pvid=54a76a4b-5dff-4a79-b6dd-219586035acf&algo_exp_id=54a76a4b-5dff-4a79-b6dd-219586035acf-3&pdp_ext_f=%7B%22order%22%3A%22309%22%2C%22eval%22%3A%221%22%7D&pdp_npi=6%40dis%21EUR%212.31%210.87%21%21%2118.88%217.14%21%40210390c917557775101877624efd25%2112000046905198781%21sea%21IE%210%21ABX%211%210%21n_tag%3A-29910%3Bd%3Aefff38b4%3Bm03_new_user%3A-29895%3BpisId%3A5000000174211148&curPageLogUid=g69DhbDykCE8&utparam-url=scene%3Asearch%7Cquery_from%3A%7Cx_object_id%3A1005008841266415%7C_p_origin_prod%3A&search_p4p_id=202508210458301928654897414240003143910_1|Screw Cap Head M3 10mm]]|  3  | 
-|[[https://www.aliexpress.com/item/1005008841266415.html?spm=a2g0o.productlist.main.4.50dd2550nYYHHV&aem_p4p_detail=202508210458301928654897414240003143910&algo_pvid=54a76a4b-5dff-4a79-b6dd-219586035acf&algo_exp_id=54a76a4b-5dff-4a79-b6dd-219586035acf-3&pdp_ext_f=%7B%22order%22%3A%22309%22%2C%22eval%22%3A%221%22%7D&pdp_npi=6%40dis%21EUR%212.31%210.87%21%21%2118.88%217.14%21%40210390c917557775101877624efd25%2112000046905198781%21sea%21IE%210%21ABX%211%210%21n_tag%3A-29910%3Bd%3Aefff38b4%3Bm03_new_user%3A-29895%3BpisId%3A5000000174211148&curPageLogUid=g69DhbDykCE8&utparam-url=scene%3Asearch%7Cquery_from%3A%7Cx_object_id%3A1005008841266415%7C_p_origin_prod%3A&search_p4p_id=202508210458301928654897414240003143910_1|Screw Cap Head M3 22mm]]|  2  | 
-|[[https://www.aliexpress.com/item/1005008841266415.html?spm=a2g0o.productlist.main.4.50dd2550nYYHHV&aem_p4p_detail=202508210458301928654897414240003143910&algo_pvid=54a76a4b-5dff-4a79-b6dd-219586035acf&algo_exp_id=54a76a4b-5dff-4a79-b6dd-219586035acf-3&pdp_ext_f=%7B%22order%22%3A%22309%22%2C%22eval%22%3A%221%22%7D&pdp_npi=6%40dis%21EUR%212.31%210.87%21%21%2118.88%217.14%21%40210390c917557775101877624efd25%2112000046905198781%21sea%21IE%210%21ABX%211%210%21n_tag%3A-29910%3Bd%3Aefff38b4%3Bm03_new_user%3A-29895%3BpisId%3A5000000174211148&curPageLogUid=g69DhbDykCE8&utparam-url=scene%3Asearch%7Cquery_from%3A%7Cx_object_id%3A1005008841266415%7C_p_origin_prod%3A&search_p4p_id=202508210458301928654897414240003143910_1|Screw Cap Head M3 30mm]|  2  | 
-|[[https://www.aliexpress.com/item/1005008841266415.html?spm=a2g0o.productlist.main.4.50dd2550nYYHHV&aem_p4p_detail=202508210458301928654897414240003143910&algo_pvid=54a76a4b-5dff-4a79-b6dd-219586035acf&algo_exp_id=54a76a4b-5dff-4a79-b6dd-219586035acf-3&pdp_ext_f=%7B%22order%22%3A%22309%22%2C%22eval%22%3A%221%22%7D&pdp_npi=6%40dis%21EUR%212.31%210.87%21%21%2118.88%217.14%21%40210390c917557775101877624efd25%2112000046905198781%21sea%21IE%210%21ABX%211%210%21n_tag%3A-29910%3Bd%3Aefff38b4%3Bm03_new_user%3A-29895%3BpisId%3A5000000174211148&curPageLogUid=g69DhbDykCE8&utparam-url=scene%3Asearch%7Cquery_from%3A%7Cx_object_id%3A1005008841266415%7C_p_origin_prod%3A&search_p4p_id=202508210458301928654897414240003143910_1|Screw Cap Head M3 8mm]]| ] 2  | 
-|Screw Countersunk M3 10mm|  12  | 
-|Screw Countersunk M3 16mm|  4  | 
-|Screw Countersunk M3 8mm|  1  | 
-|Screw Grub M3 6mm (optional)|  2  | 
04_projects/03_rpi2040_pico_mmu.1755778157.txt.gz · Last modified: by jattie