This is a vibrating plate. I designed it as an alternative for ultrasound bath as i have been working with samples that require mechanical agitation but cannot resist the formation of cavitation bubbles and would break if exposed to classical sonication bath.
There are two versions, 10 and 15 cm wide. Both use vibrating motors (motors with eccentric loads. Each version has two motors, one oriented horizontally and the other vertically. Using both prevents the formation of static waves and maximize agitation.
The plates are designed to hold standard Bechers or glass petri dishes. To transmit the mechanical vibrations to the glassware i design clamps with a TPU bowstring-like part, adjusted by a long M3 screw. The rigid and flexible parts of the clamp are hold together by small pieces of 3D filament.
The plate base also includes a holder for a lab stand based on 8mm tubes. I will release shortly the files for a printed modular lab stand system i designed, and place the link here. Until then any 7 to 8mm tube based lab stand will be compatible.
Those vibrating plate can also be used with a printed modular holder system as shown in the cover picture. All the elements of that system can be found here: https://www.thingiverse.com/thing:7329310
To build this plate you will need: 

• 4x 6 mm OD, +-50mm long compression springs. The system rigidity and resonance frequancy will depend on the spring rigidity. A spring wire diameter of 0.6 to 0.7 is recommended, 0.5 to 1 mm should be usable.
  -12x 12mm M3 screws to hold the springs and close the plate box
  -3x 30mm and 3x 5mm M3 for the clamps
• about 10 to 20 4.2mm OD, 4 or 5mm long M3 melt insert for the clamps and to close the plate box
• various M3 bolts to hold the electronic and the motors
  On the electronic side you will need:
• 2 vibrator motors
• 1 DC motor speed controler
• 1 DC alimentation between 6 to 12 V
• 1 DC-DC buck converter
• 2 interrupters
  The electronic can be sourced from you favorite supplier but i used the chinese taobao for price reasons. Bellow are the links to the products i used:
  Motors (15cm version): https://item.taobao.com/item.htm?id=560835643622&mi_id=0000hPypT1EBD8fiYCIP0C87QdGhUPbDhbpp2k4WWQdUoPk&spm=tbpc.boughtlist.suborder_itemtitle.1.7ae12e8dIHBCYo Motors (10cm version): https://detail.tmall.com/item.htm?id=744358252907&mi_id=0000_BhLNbB9QP0eHukC3cpXUdFOvWdCP2POYQZ5eWYnM-M&skuId=5137137433051&spm=tbpc.boughtlist.suborder_itemtitle.1.7ae12e8dIHBCYo (0612) and https://detail.tmall.com/item.htm?id=577868295040&mi_id=0000sjuSEhrFZ6Uh1z_PyWJzj2FEqQdBYwL_e1HNqvWdikc&skuId=5304241014082&spm=tbpc.boughtlist.suborder_itemtitle.1.7ae12e8dIHBCYo (1234)
  Alimentation: https://item.taobao.com/item.htm?id=705210103424&mi_id=0000KUDaG0h7VBb4QcVmJxMGvrwaamNuRM2HsBotFjTUros&spm=tbpc.boughtlist.suborder_itemtitle.1.7ae12e8dIHBCYo
  Speed controller: https://detail.tmall.com/item.htm?id=617031533010&mi_id=0000NCJnwbBkR5yOf4ExAba1CyMMv-b3StO_SjD1c-52zvQ&skuId=4522404682176&spm=tbpc.boughtlist.suborder_itemtitle.1.7ae12e8dIHBCYo (1.8-12V 2A)
  Buck converter: https://detail.tmall.com/item.htm?id=41307963557&mi_id=0000f2nRqsPQirUEVRnzLzAXgtpmoTqXAFVKZhtM7Z9iQLU&spm=tbpc.boughtlist.suborder_itemtitle.1.7ae12e8dIHBCYo&skuId=4031579316016 (LM2596S)
  Interuptors: https://item.taobao.com/item.htm?id=42000481454&mi_id=00007hTxFhBmpqEXkpENTQrQzyLBluDSGkKUeYDci1ngzhI&spm=tbpc.boughtlist.suborder_itemtitle.1.7ae12e8dIHBCYo (3-2 ON ON)