3D Printed Replacement Parts ...

Collection of automotive design / construct projects by Bantum ...

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Bantum
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Stumped ...

Post by Bantum » Fri Jun 26, 2026 4:21 am

I've been out & about doing the back roads around Brisbane & eventually got a puncture, so had to chage tyres -

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I come to swap wheels & dig out the jack ( bit of a faff getting it out from under the rear recess in the Forester ) & thoughts turned to about needing a suitable lifted block to place the jack on - hence this beast :

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Will post some more updates when I've finished printing it ... ( 24 hrs )

Cheers, Bantum ...

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El_Freddo
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Re: 3D Printed Replacement Parts ...

Post by El_Freddo » Fri Jun 26, 2026 7:42 pm

Will that be strong enough to hold the weight of the vehicle on the jack?

I don’t think I’d be trusting it!
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Bantum
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Calculations ...

Post by Bantum » Sat Jun 27, 2026 4:03 am

Yep I recon it will - I've done some basic calc's :

Structure : It will be a Double Box design ( an outer box approx 150x150x100mm + inner 50x50x100mm ) with 8mm walls + bracing ( 20 % infill + 4 wall line count ) At an ABS density of 1.04 g/cm³, the box itself will weigh approximately 880 grams.

Loads : A basic formula used to find the maximum axial load a wall can bear is:\(P_{n} = f_{c} \times A_{g}\)
Where:\(P_{n}\) = Maximum axial load capacity (kN or kgs).\(f_{c}\) = Allowable compressive strength of the wall material (MPa or psi).\(A_{g}\) = Gross cross-sectional area of the wall.

- Vertical Compressive Load ( Stacking Weight ) - So If you place a Jack on top of the 'box' and put weight on it ( e.g. a Car - approx 1500 kg / 4 = 375 kg at lift point ) - With the forces running down the walls / bracing, the available cross-sectional area of all these walls is roughly 8,000 mm².

Calculation : So Input the above figues of : 1.04 x 8000 = 8320 g - Even at a 20% infill density, it should technically support over 500 kg of static crushing weight before the walls would buckle or delaminate.

I'll obiously test it first to see how much deflection it gets & see how it goes ... :)

Ciao, Bantum ...

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