M39 rear cap

thingiverse

This Rear Cap Mounts Perfectly on M39 Lenses, Like This One I've Attached to My Trusty Jupiter 8 Lens. Print Settings Unchanged Here: Rafts Don't Matter - They Stay the Same Supports Remain Unaltered Resolution Set at 0.2 for Crystal Clear Prints Infill Rate Stays at a Firm 20% to Preserve Density Additional Notes and Adjustments Are Possible with Minor Changes to this Line: clearenceM39 = 1.0; // Increase or Decrease the Play Between Nut and Bolt