Bellow suction cup

Need a suction cup today for tiny pickups and a larger one tomorrow? This setup makes it easy. The Onshape model is fully parametric—change a few variables, let it rebuild, export the STL, and slice. No CAD rework needed. Here’s a snapshot of the key parameters:Onshape Model VariablesVariableDescriptionSuggested Rangelip_diameterDiameter of the sealing rim15–50 mmbellow_angleFold angle (defines 30°/60° lip flare)45–65°peak_to_peak_pitch_multFold pitch relative to diameter0.15–0.25×Dwall_thicknessBellows wall width0.8–1.2 mmhose_ODOuter diameter of the push-fit stem4–10 mmpress_fit_biteInterference amount for seal0.15–0.30 mmbarb_heightBarb protrusion for hose hold0.10–0.35 mmWhy it works (in plain terms)2.5 bellows hit the sweet spot—enough vertical travel for most parts without wasting pumping time.Lip flare and thickness follow Piab-style molds that reliably seal even slightly rough surfaces.Variable hose interface lets you dial in just enough grip for a spring sleeve or smooth tube—