Print-in-place · PETG · 0.20 + 0.28 mm layers

Reading Guide Mechanism

Two sliders in keystoned tracks, printed as one piece. Drag the controls and watch the aperture uncover the page underneath. The left and bottom edges of the window are frame and never move — those are the two you aim. Shapes are the real exported geometry, not a sketch.

70.0

One jaw, on the right, in a keystoned track cut into the bottom bar. The left edge is frame.

12.0

One blade, in keystoned tracks down both side rails. The bottom edge never moves.

Aperture70.0 × 12.0
Lines visible2
Overall footprint184 × 81
Jaw stands proud56.0

As printed: everything shut. Open it after it comes off the plate.

Why it survives printing

blade jaw frame 0.28
  • 0.28 mmVertical gap — exactly one layer. A 0.20 gap falls between two slice planes and the parts print welded together.
  • 0.20 mmLateral gap, on every sliding face. Measured off a working print-in-place caliper, not guessed.
  • 20°The keystone lip. Each slider is a trapezoid, full width at the bed and drafted in 0.6 mm per side at the top, so the track's mouth is narrower than the slider's base and nothing lifts out. The only overhang is that lip, 20° off vertical.
  • shutIt prints closed, so every moving face has material 0.28 below it to bridge onto instead of open air.