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Wiring Diagram
Mar 12, 2026
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ProtoNaut

ProtoNaut is a custom-designed 3D printer. Built using 2020 aluminum extrusions, linear rails, and NEMA 17 stepper motors, this printer aims to deliver reliable performance in a compact cantilever design while maintaining a budget-ish build cost of approximately $400.

The project utilizes Klipper for motion control, running on an Orange Pi Zero 3 with a BIGTREETECH SKR PICO controller. The design tries to achieve precision, ease of assembly, and fully open-source design through FreeCAD CAD files.

Images

BUILD

CAD - click to expand

ProtoNaut CAD

Features

  • Cantilever Design
  • Magnetic PEI Bed
  • Automatic Bed Leveling using the BTT EDDY
  • Klipper firmware
  • 150x150mm Build Volume

BOM (Bill of Materials)

ONLINE GOOGLE SHEETS

Item Qtty 4.19€ Source Extra Category Item Total Final Total Final Total ($)
Bed Spring Leveling kit 1 5.19€ https://es.aliexpress.com/item/1005003097384079.html Black(M3) 1Set Bed 5.19€ 346.64€ $398.13
Bed support Y axis 1 10.49€ https://es.aliexpress.com/item/1005005526138056.html Bed 10.49€
12V 80W heatbed 150x150 1 8.59€ https://es.aliexpress.com/item/1005001417127602.html Bed 8.59€
Magnetic Sticker 1 5.09€ https://es.aliexpress.com/item/1005007297499038.html Bed 5.09€
Orange Pi Zero 3 1 21.11€ https://es.aliexpress.com/item/1005005785695181.html Bundle 3, 1GB RAM Electronics 21.11€
BIGTREETECH SKR PICO 1 22.39€ https://es.aliexpress.com/item/1005009051136182.html Electronics 22.39€
12V PSU 1 18.99€ https://es.aliexpress.com/item/1005007287646072.html LRS-100-12 Electronics 18.99€
24V PSU 1 33.59€ https://es.aliexpress.com/item/1005007234003604.html LRS-200, 24V Electronics 33.59€
PSU terminals 1 2.95€ https://www.aliexpress.com/item/1005007254348481.html Electronics 2.95€
HGX Lite 1 19.19€ https://es.aliexpress.com/item/1005006950563760.html Red add Motor Extruder 19.19€
TZ E3 2.0 Hotend 1 14.89€ https://es.aliexpress.com/item/1005008453023317.html Hotend -- B2468 Extruder 14.89€
BIGTREETECH EDDY 1 20.59€ https://es.aliexpress.com/item/1005006917784069.html Extruder 20.59€
4010 blower 1 3.19€ https://es.aliexpress.com/item/1005009427457896.html 4010 24V 2P2.54 Extruder 3.19€
3010 fan 3 1.70€ https://es.aliexpress.com/item/1005001303394448.html 3010 24v Extruder, Electronics 5.10€
Idler 20T W6 B3 1 4.19€ https://es.aliexpress.com/item/1005009619469013.html 20T W6 B3 With T Linear 4.19€
Idler 16T W6 B3 1 4.19€ https://es.aliexpress.com/item/1005009619469013.html 16T W6 B3 With T Linear 4.19€
Idler 20T W6 B5 1 4.19€ https://es.aliexpress.com/item/1005009619469013.html 20T W6 B5 With T Linear 4.19€
belt 6mm 1 4.29€ https://es.aliexpress.com/item/1005004822740666.html 6MM 2GT, 2 meters Linear 4.29€
Pulley 20T W6 B5 2 1.14€ https://es.aliexpress.com/item/1005009023224783.html 20T W6 B5 Linear 2.27€
Nema 17 stepper 3 7.69€ https://es.aliexpress.com/item/1005008459399126.html Motor 23.07€
5mm Pin 1 4.49€ https://es.aliexpress.com/item/4000473863693.html 25mm screws 4.49€
m6 10642 screw 1 2.65€ https://es.aliexpress.com/item/32934186482.html M6, 30mm screws 2.65€
m6 4762 screw 1 3.39€ https://es.aliexpress.com/item/1005006999030038.html M6, 30mm, DIN912 screws 3.39€
m5 10642 screw 1 1.44€ https://es.aliexpress.com/item/32934186482.html M5, 8mm screws 1.44€
m3 10642 screw 1 3.59€ https://es.aliexpress.com/item/32934186482.html M3, 40mm screws 3.59€
m3 4762 screw 1 2.99€ https://es.aliexpress.com/item/1005006999030038.html M3, 8 mm, DIN912 screws 2.99€
m3 4762 screw 1 2.76€ https://es.aliexpress.com/item/1005006999030038.html M3, 6 mm, DIN912 screws 2.76€
m3 4762 screw 1 3.09€ https://es.aliexpress.com/item/1005006999030038.html M3, 14 mm, DIN912 screws 3.09€
m3 4762 screw 1 3.19€ https://es.aliexpress.com/item/1005006999030038.html M3, 16 mm, DIN912 screws 3.19€
m3 4762 screw 1 3.29€ https://es.aliexpress.com/item/1005006999030038.html M3, 20 mm, DIN912 screws 3.29€
M5 T-nut 1 3.39€ https://es.aliexpress.com/item/1005008147125860.html 20-M3 screws 3.39€
M3 T-nut 1 3.29€ https://es.aliexpress.com/item/1005008147125860.html 20-M5 screws 3.29€
M6 Tap 1 4.59€ https://es.aliexpress.com/item/32788074995.html screws 4.59€
3mm Pin 1 3.29€ https://es.aliexpress.com/item/4000473863693.html 30 mm screws 3.29€
heatset inserts 1 3.39€ https://es.aliexpress.com/item/1005007973137842.html M3x5x4 screws 3.39€
2020 extrusion 1 2.65€ https://es.aliexpress.com/item/1005003299342998.html 130mm Structure 2.65€
2020 bracket corner 1 6.19€ https://es.aliexpress.com/item/1005005748992965.html Structure 6.19€
MGN9C rail 1 9.79€ https://es.aliexpress.com/item/1005009577277063.html 200 mm X axis 9.79€
2020 extrusion 1 4.09€ https://es.aliexpress.com/item/1005003299342998.html 250 mm X axis, Y axis, Structure 4.09€
2020 extrusion 1 6.69€ https://es.aliexpress.com/item/1005009577277063.html 250 mm X axis, Y axis, Structure 6.69€
MGN12c rail 2 10.69€ https://es.aliexpress.com/item/1005009577277063.html 200 mm Y axis, Z axis 21.38€
5x8 coupler 1 3.59€ https://es.aliexpress.com/item/1005006305848755.html 5x8 Z axis 3.59€
T8 lead screw 1 5.29€ https://es.aliexpress.com/item/1005003312523975.html 250 mm, Pitch 2mm Lead 8mm Z axis, Linear 5.29€
2020 extrusion 1 4.59€ https://es.aliexpress.com/item/1005003299342998.html 280 mm Z axis, Structure 4.59€

Estimated Total Cost: €344.04 (~$396.46 USD)

Design Specifications

  • Build Volume: 150mm x 150mm
  • Bed Type: Heated magnetic adhesion surface
  • Motion System: Linear rail guided on all axes
  • Nozzle Type: 0.4mm standard
  • Control Board: BIGTREETECH SKR PICO
  • Host Controller: Orange Pi Zero 3 (1GB RAM)
  • Firmware: Klipper with Mainsail/Fluidd interface

Wiring Diagram

wiring

License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

CC BY-NC 4.0

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