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Overview

Developed by: armpit PitClamp Mini is a 3D-printed modular quick-release mount ecosystem designed for NEMA23 motors used in OSSM builds. The system has been stress tested to 50 ft-lb without grip compromise (PLA, 6 walls, 10% infill).

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Supported Motors

57AIM

Models: 30/15/10“Gold Motor” = 57AIM30 (Recommended)

42AIM

Models: 30/15/10“Round Motor” = 42AIM30

iHSV57

Models: 180w/140w/100w
PitClamp Mini with 57AIM30 motorPitClamp Mini with 42AIM30 motorPitClamp Mini with iHSV57 motor

PitClamp Mini with different motor configurations

The iHSV57 ring prints as one piece but snaps into two halves after removal from the printer. Clasp each half around the motor to assemble.
iHSV57 motors smaller than 180w require modifications to the ring design.
Configure your slicer with these settings for optimal strength and fit.
SettingValue
Walls6
Infill typeCross Hatch or Gyroid
Infill percentage10%
SupportsTree Supports, 5° threshold angle
SeamNearest (or your preference)
Print all parts in the default file orientation. Printing base components in other orientations causes structural weakness.
If your printer is well-calibrated with optimal layer adhesion, use the print-in-place Upper+Handle variant from the Non-Standard folder.

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Resources

Bill of Materials

Hardware requirements

Assembly Guides

Video tutorials

Updates

Version history

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Features

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Quick-Adjust Rotation

The mount provides 4-degree precision quick-adjustable rotation, allowing you to fine-tune the motor angle without disassembly.

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Modular Base System

Your motor can be quickly removed from the mount for storage or transferred to another base. Choose from multiple base options:
  • Mounts to 3030 or 4040 extrusion (top mount)
  • 64mm M6 hole spacing
  • ~30mm overall width
Compatible with POWERTEC 71408 or similar guide rail MFT clamps.
Search for “Guide rail MFT ratchet clamp” to find compatible products.
Folds flat for easier frame storage, such as sliding under a bed.
A fully printed tabletop clamp solution is under development.

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Motor Cover and Electronics Support

PitClamp Mini mounted with motor cover installed

PitClamp Mini in action with motor cover

The v1.1 Ring (available for 57AIM only) supports both M5 Hex Nuts and M5 Hex Coupling Nuts (20mm). When using Coupling Nuts, the ring features ridges for an interlocking connection to an optional rear motor cover.
Recommended setup: Use M5 Hex Coupling Nuts (20mm) for motor cover compatibility.

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Ring Offset Specifications

  • Ring offset: +5mm from the face of the PitClamp Mini Base
  • Standardized after clearance testing against various rail tensioners
  • Compatible with both 3030 and 4040 extrusion alignment
57AIM30 front left view42AIM30 front left viewiHSV57 front left view

Front left view of all motor configurations