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    Incra fence stop block with micro-adjust

    Feb 27, 2026 Update

    The stop block files are updated and corrected so that the T-bolts properly contact the rail. (My apologies to anyone who may have wasted time and filament on the prior design.)

    This is a stop block designed for the Incra miter gauge fence (https://incra.com/miter_gauges_accessories_telescoping_flipfence.html)
    This can be used in 3 configurations:

    1. Just print one of the stop block files and a T nut knob to use as a standard sliding fence stop.

    2. Print the stop block file B and then either A left or A right (depending on how your fence is set up. Assemble as described below and you can precisely tune your cuts.

    Parts:
    To assemble the two part stop block, you will need to print:
    Thumbwheel -1
    T nut knobs -2 (For the T nut knobs, I used this design: ( https://www.thingiverse.com/thing:5325530/files ) Print at 102% as these are quite tight.
    Stop block part B- 1
    Stop block part A (left or right) -1
    I printed the blocks in PLA with 3 walls, 20% gyroid fill and tree supports only touching the plate.

    Hardware  2 T bolts  1/4-20  x 2 in  3  hex nuts 1/4-20 (for knobs and Part B)  1 hex bolt  1/4-20 x 2 in

    Assembly

    1. I like to run the bolts through the holes a few times to insure they are moving smoothly.
    2. Drop thumbwheel into Part A with the hex opening facing the larger hole.
    3. Drop the hex bolt in through the larger hole and press into the opening. (I recommend using some epoxy to hold in place). You may need to press the bolt in with a tool to seat properly.
    4. Drop a hex nut into the slot on Part B, insert the protruding bolt from Part A and spin it on. May take a little adjustment to catch the nut.
    5. The remaining hex nuts can be pressed into the T nut knobs. These are quite snug and likely requite a tool to seat them, but no glue is needed.

    To use the stop block, first slide it onto the fence. Once you are in range, lock down Part A and adjust Part B as needed. Lock down Part B before starting to cut

    Additional key words
    micro adjust
    micro-adjuster
    microadjuster
    fine adjust