Work / Hardware

40 mm corner bracket, all parts — All parts, as they come off the printer1 part

Technical details

Part: bracket — primitives.l_bracket at the parameters in params.py. Fits M3 socket-head or pan-head screws (3.6 mm printed hole = ISO 273 medium 3.4 + 0.2 oversize).

Print orientation: on its side, i.e. the L profile lies in the bed plane and the 20 mm width is the print height, so bending load at the corner runs along the layers instead of across them. Consequently every hole is horizontal and is cut as a teardrop (point up) so it bridges cleanly.

Assumptions (user not available): width 20 mm; holes evenly spread over the free span of each arm (centres 10 / 22 / 34 mm from the outer corner, on the width centreline); sharp outer corner; 1 mm inside fillet; no counterbores.

Parts

Part	Size (mm)	Volume	Thinnest wall	Printability
bracket	40 × 40 × 20	5.7 cm³	2.7 mm	passes

Engineering views

bracket: isometric, top and front views — bracket

Downloads

bracket.stepSTEP · 146 KB
bracket.stlSTL · 171 KB
l_bracket_40.3mfwhole plate · 41 KB

Library parts used

Parametric components shared with the other designs; see the parts library.

Component	What it does	Printed in
L bracket `primitives.l_bracket`	90-degree L (angle) bracket with a row of screw clearance holes along each arm, standing on its side on z=0 (strongest print orientation).	not yet

Source: models/l_bracket_40 · built 2026-09-09 13:43

Hardware

40 mm corner bracket

A stiff 40 mm L-bracket for M3 screws, oriented on the printer so the corner is as strong as it can be.

Printed on its side so the load runs along the layers, not across them. The simplest thing here, and a good example of how orientation decides strength.

$10.00for one in PLA, printed as designed

Size: 40 × 40 × 20 mm
Print plate: 40 × 40 × 20 mm
Parts: 1
Filament (PLA): about 6 g
Print time: about 0.6 h
Status: Ready to print

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