Micro Microrack Rack Triple minimal v2.2 (three breadboards rack) pre-release

WARNING

At the time of designing this, I do not yet have actual Microrack modules in hand. Please note:

• Module/knob heights may be misjudged — clearance and usability with Microrack synth modules is not guaranteed, while I made my best guess based on microrack modules photos.
• Breadboards included with the official Microrack kit may differ slightly in size, though they are also 830-pin boards and I expect them to fit.

Overview

This is a triple-breadboard rack, an evolution of my earlier double-rack design, created for future use with Microrack modular synths.

Microrack modules are designed to be mounted on standard breadboards. This rack provides a stable, angled frame for three 830-pin breadboards.

Compatibility

Designed around the common MB-102 830-pin breadboards (approx. 165×54 mm).
Other 830-pin breadboards should also fit, but sizes may theoretically vary slightly across brands.

Assembly Requirements

• 5× M4 threaded rods, ~178 mm long
  (4 rods will work, but 5 improves rigidity)
• 10× M4 nuts (2 per rod)
• 10× M4 washers ( 0.75 mm thickness worked for me fine)
• Screw gun (to screw rods into printed tubes)
• 3× 830-pin breadboards

• Printed parts (see below)

  Breadboards are positioned at a 150° angle relative to each other

Printed Parts

• Micromicrorackrack_minimal_triple_Sidebar.stl
  x1 regular , x1 mirrored ( to produce the second side)

• Crossbar_tube_for_4mm_178mm_rod.stl
  x5
  ~160mm long tube that holds each metal rod. These are optional but recommended for:

  1. Hiding sharp threads for aesthetics and safety
  2. Improving rigidity
  3. Acting as end stops for nuts to prevent bending

  (Can be replaced with additional inner nuts if desired, but in that case you should be extra carefull with nuts tensioning, to evade bending the sidebars too much)

• Cut_guide_178x4mmrod.stl
  (Optional, x1) A helper guide to cut rods to correct length with dremel cut disc. Not used in assembly.

Material and Printing Notes

• Printed in PETG, which has low thermal shrinkage.
• If using PLA, you probably may need to scale up the model slightly, but I do not have specific guidance for that.
• Use big amount of walls and infill level. I used 12 walls with 0.4 nozzle nad 60% infill and quite happy with results. Considering that these parts are not very fat, it should not really consume a lot of plastic even for high infill values, so economy does not worth it.

Source Files

All .FCStd files (FreeCAD 1.1.0dev build 42180) are included.

• The sidebar model is parametric, with key dimensions exposed via the Spreadsheet section.
• FreeCAD may become unstable if parameters are changed drastically.