Table Saw Fence Spacer for Safe Miter Cuts

I saw the idea for this on Instructables by Workshop Edits, but that version had some improvements needed. 

To explain what this does: when you need to make repeated cuts using the miter gauge (cross cuts) on your table saw, you could clamp a spacer block against the fence so that once you move the material through, it leaves the spacer and there's a gap between the material and the fence - so lessens the chance of a kickback. 

This spacer version has a couple of features. 

1-It sets the distance to exactly 1/2". So you can still use the gauge on your saw to setup your cut - just subtract a half-inch from whatever you're reading on the ruler.  (You've got an accurate ruler on for your fence, right?)

2-It has a built-in screw to clamp it in place or remove it quickly. 

3-The top of the spacer part itself is slightly sprung (slanted) away from the side of the fence. When you clamp it in place, it pull both the bottom and top edges tight against the fence. 

4-It has a slight undercut at the bottom so that sawdust on the table doesn't effect the accuracy of your cut. 

5-This should fit Biesemeyer fences and others with a similar design. 

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Printing:

I printed both the spacer and the clamping screw in PETG on a Prusa MK3 without any supports. 

Print the spacer on it's side. This way there is less chance of cracking it along a layer line when you tighten it up. Print the screw with the screw head flat against the printer bed.  I used 4 perimeters for the screw, 20% infill and it seems very solid. 

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Usage:

Set the spacer back far enough on the fence so that the back edge of whatever material you're cutting passes beyond the spacer well before the front edge contacts the blade. Tighten the screw just enough to secure the spacer and pull the top of the spacer firmly against the fence.