Geometric Pineapple wall art:

Default size is around 120cmx55cm
44 pcs (all parts can be printed at full size on a standard printer bed)
the model on photos was realized with a print scale at 75%

All parts are numbered on the back and here you can find the numbers assignment :
Geometric Pineapple fullsize (pdf)

Organize pieces to the wall:

use paper mask
print pdf it with the same scale of your 3D print. cut all "triangles" (or only triangle's corners) tape it to the wall at the right level then place pieces to the wall.
custom scale or custom paper format: you can generate the paper mask with the scale and the paper format that you want using adobe acrobat reader Dc ( free version) it lets you print in "poster" mode and select the paper format that you want.
use projector
print one or two page of the paper mask with the same scale of your print and tape it/them to the wall at the right level
project the fullsize pdf, scale it and level it to the paper mask

Fix pieces to the wall:

use velcro tape
use double sided tape
use hot glue
use blu-tack ( you can also add small pieces of paper tape between wall and blu-tack to be sure to not have any traces to the wall)
...

paper mask: (print on A4 pages without margin and resizing)
you can use one page to place your first pieces to be sure to have it at the right level

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