3D-4-VELO

The connection module can be parametrically adapted to any pipe size. Only approximate dimensions are necessary, as the bracket snaps into place at short intervals. The design exploits the flexibility and tensile strength of the thin PLA against the layer.
The elevation ensures one-handed, tool-free compression of the loop during assembly. It is recommended that a strip of used bicycle inner tube be placed under the sling to protect it from slipping and paint. The lever in the large opening prevents the loop from slipping and releases it when actuated. The bayonet connection on the upper side can be used on four sides for mounting accessories. The lever in the small opening fixes the connection of the accessories.

The brake lever is a heavy-duty accessory on a bicycle. Nevertheless, it can function reliably with FDM printing. Except for the bowden cable there are no additional parts. The developed stable and smooth-running joint can be printed without support structure and is based on two curved surfaces rotated around a common axis. They have no overhanging surfaces. The double outer wall and the visible filling structure give the brake handle increased flexibility while maintaining the same rigidity.

To support the high weight, the bicycle edges have a stabilizing open infill structure. The optimized joint is supplemented by a lock. The double fastening ensures a stable opening angle and a firm hold on the frame. The distance between frame and floor is preset by the digital production. Users who descend on the right side of the wheel can produce the stand mirror-inverted. Due to the size, a large printing area must be available or the stand must be divided and tightly assembled after printing.

A mudguard should prevent water and dirt from splashing up, so no high stability is required. Metal mudguards are fixed several times against noise, which is not necessary with plastic. The flexibility prevents the wedging of foreign bodies. Most bikes have only little space between frame and tire and a hole for fastening. However, the connection modules attached to tubes to the right and left of the wheel provide a torsion-proof hold. The brackets on the mudguard can be bent up to an angle of 30°.

Additional saddles to place children on the top tube are often difficult to get, expensive, time-consuming to install and remove. This is expressive without support structures. The shape is ergonomically adapted to the sitting position of a child. The supporting inner structure has a slightly springy effect, increases the breaking strength and allows water to drain off quickly, e.g. in rain. The bayonet connection of the holder is larger here for the higher load. The corresponding footrests are attached to the fork and prevent the feet from slipping into the spokes. By the connectors the height can be adapted fast to different children or the supports between several mountings be changed.

Many other parts have to be attached to the bike: cables and bowden cables, a lock, lamps and so on. For these purposes I have designed various brackets, most of which use the residual stress of the material for fixing. Springy elements are correspondingly designed with deduction of the spring travel. Like the connection modules, the brackets can be parametrically adapted to any diameter.