Take two identical 30 degree knife blades, make sure they are held firmly against each other and insert them into a plastic handle.
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Then, use this custom-made knife to cut along a ruler, thin laserprint paper is recommended as inkjet paper delaminates easily. Make sure the ends are not detached from the bulk of the paper.
Then comes the clever part, insert a wooden plank to pull the stripes tight, in order to attach the vertical columns
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Attaching the vertical columns are best aided with a ruler to help making the intervals constant, the protruding parts can be trimmed later.
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Comparison with Lasercut rails:
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As seen here, the scratchbuilt rails gives a more 3d look, and does not have dark edges like the lasercut ones. --But still, colouring is always an option
Handrails for ladders can be made with the same method, only now cutting curves:
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The thickness of the railing can be easily controlled by inserting a thin piece of metal between the blades.
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