Cold frame - Frühbeet

Spring is coming! Ever since I bought a 3D-Printer, one of my ideas was to create a flexible, easy to scale and inexpensive cold frame for sectors of my raised bed. A 1m x 1m Cold frame is very inexpensive: 5 € (2 for the pipes, about 3 for the filament). A used foil you can get for free from a furniture shop or elsewhere.

Things you need:

1. 4 x 3m/16mm Installation conduit (5 if you make an etxra arc (bow) in the middle or a ventilation opening on one or both sides)
2. about 4m2 foil
3. 4 - 8 little wood screws (about 15 mm long) for the bows
4. Printed parts
a) 18 x HB_type_one_connector
b) about 30 clips
optional:
c) 2 - 4 holder for ventilation, only if you make one or two
d) 5 x HB_type_two_connectors + 4 x HB_type_one_connector, only if you make longer frames, for an in between arc.

For a 1 m x 1 m frame you need to do:
1. For the 2 arcs: Cut off 2 x 2 m pipes and put 8 x HB_type_one_connectors on it , cut off 2 x 1m pipes, put 1 x HB_typ