diff --git a/Makefile b/Makefile
index 416cc8d..0addcb7 100644
--- a/Makefile
+++ b/Makefile
@@ -1,15 +1,10 @@
-.PHONY: stl 3mf dxf
+.PHONY: stl dxf
 
 stl:
 	openscad --export-format binstl -o upper_case.stl upper_case.scad
 	openscad --export-format binstl -o lower_case.stl lower_case.scad
 	openscad --export-format binstl -o plate.stl plate.scad
 
-3mf:
-	openscad --export-format 3mf -o upper_case.3mf upper_case.scad
-	openscad --export-format 3mf -o lower_case.3mf lower_case.scad
-	openscad --export-format 3mf -o plate.3mf plate.scad
-
 dxf:
 	sed -i 's/\/\/ projection/projection/' plate.scad; openscad --export-format dxf -o plate.dxf plate.scad; sed -i 's/projection/\/\/ projection/' plate.scad
 	openscad --export-format dxf -o weight.dxf weight.scad