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Okee, thank you for your quick response. I think i go for steppers.

Hello Josh, Your idea of Arduino is very interesting. I have immediately bought a Eumig S 807 and disassembled it. I am planning to create a new drive with a toothed belt. Now I wonder which is better to use a stepper motor or a servo motor? And what is the best methode to capture the film, start and stop or continuous drive?