Summary

UPDATE: I found some really cool Thumb Screws for this, but they were Metric, so I've uploaded the New Metric STL files and renamed the old Files as Imperial. Also added a STEP file of the Metric version.

M6 Thumb Screws: https://www.amazon.com/dp/B0FDG9KMC4?ref=fed_asin_title&th=1
M4 Thumb Screws: https://www.amazon.com/dp/B0FB14Y621?ref=fed_asin_title&th=1

A Remix of this Sanding Block in 2 Sizes [Big - 25mm x 70mm & Small - 15mm x 70mm]

Print Settings

Printer:

Kywoo 3D

                                            <p class="detail-setting rafts"><strong>Rafts: </strong>                     <div><p>No</p></div></p>                                                                                <p class="detail-setting supports"><strong>Supports: </strong>                     <div><p>No</p></div></p>                                                                                <p class="detail-setting resolution"><strong>Resolution: </strong>                     <div><p>.15mm</p></div></p>                                                                                <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>30%</p></div></p>                                                    <strong>Filament:</strong> Hatchbox PLA                Any

Post-Printing

Post Print Instructions

            <div><p>Big Metric:  Glue an M6 Nut into the bottom with CA glue or Weld-On 16<br>Small Metric:  Glue an M4 Nut into the bottom with CA glue or Weld-On 16<br>• Use the appropriate Thumb Screws notated above to screw in through the Tops.</p><p>Big Imperial:  You'll need to glue a 1/4" Bolt or Hex Nut into the bottom with CA glue or Weld-On 16.<br>Small Imperial:  You'll need to glue a #10 Bolt or Hex Nut into the bottom with CA glue or Weld-On 16.</p><p>Then get the appropriate Wing Nut or Thumb screw depending on whichever you glued into the bottom.  I find the Thumb Screw easier to work with when adding Sandpaper to the block, but, whichever choice works well at keeping it together.</p></div>

How I Designed This

The Printable Screw kept breaking so I changed it to accommodate either a Bolt or a Nut glued into the bottom. Then I kept making adjustments to it and finally started over from scratch to create this version.

Sanding Tools - Remix